Vehicle-direction measuring apparatus

Details Vehicle-direction measuring apparatus Vehicle-direction measuring apparatus

1992-03-13

1994-02-01

Black, Thomas G.

Boots, shoes, and leggings

364449, 36457105, 340990, G06F 1550, G01C 1738

Patent

active

052837432

ABSTRACT:
Central coordinate data located on a circle of magnetism obtained from the X-Y coordinate data detected by a terrestrial magnetism sensor are calculated in correspondence with the direction of the road, calculated using map data or by a GPS device, and a present declination correction value each time the direction of the road is obtained. The declination correction value is automatically updated in such a manner as to decrease the radius of the circle of magnetism.

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patent: 5151872 (1992-09-01), Suzuki et al.
patent: 5172322 (1992-12-01), Takano et al.
patent: 5216816 (1993-06-01), Ida

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